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Advances in Optical Technologies最新文献

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Continuous Operation of a Bragg Diffraction Type Electrooptic Frequency Shifter at 16 GHz with 65% Efficiency 16 GHz Bragg衍射型电光移频器的连续工作，效率为65%
Advances in Optical Technologies Pub Date : 2012-10-18 DOI: 10.1155/2012/676785
S. Hisatake, K. Hattori, T. Nagatsuma
{"title":"Continuous Operation of a Bragg Diffraction Type Electrooptic Frequency Shifter at 16 GHz with 65% Efficiency","authors":"S. Hisatake, K. Hattori, T. Nagatsuma","doi":"10.1155/2012/676785","DOIUrl":"https://doi.org/10.1155/2012/676785","url":null,"abstract":"We demonstrate for the first time the continuous operation of a Bragg diffraction type electrooptic (EO) frequency shifter using a 16 GHz modulation signal. Because \u0000frequency shifting is based on the Bragg diffraction from an EO traveling phase grating (ETPG), this device can operate even in the millimeter-wave (>30 GHz) range or higher frequency range. The ETPG is generated based on the interaction between a modulation microwave guided by a microstrip line and a copropagating lightwave guided by a planner waveguide in a domain-engineered LiTaO3 EO crystal. In this work, the modulation power efficiency was improved by a factor of 11 compared with that of bulk devices by thinning the substrate so that the modulation electric field in the optical waveguide was enhanced. A shifting efficiency of 65% was achieved at the modulation power of 3 W.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132980259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Photonic Heterodyne Pixel for Imaging Arrays at Microwave and MM-Wave Frequencies 微波和毫米波频率成像阵列的光子外差像元
Advances in Optical Technologies Pub Date : 2012-10-18 DOI: 10.1155/2012/792571
A. R. Criado, J. Montero-de-Paz, C. Dios, L. Garcia, D. Segovia, P. Acedo
{"title":"Photonic Heterodyne Pixel for Imaging Arrays at Microwave and MM-Wave Frequencies","authors":"A. R. Criado, J. Montero-de-Paz, C. Dios, L. Garcia, D. Segovia, P. Acedo","doi":"10.1155/2012/792571","DOIUrl":"https://doi.org/10.1155/2012/792571","url":null,"abstract":"The use of photonic heterodyne receivers based on semiconductor optical amplifiers to be used in imaging arrays at several GHz frequencies is evaluated. With this objective, a imaging array based on such photonic pixels has been fabricated and characterized. Each of the receiving optoelectronic pixels is composed of an antipodal linear tapered slot antenna (LTSA) that sends the received RF signal directly to the electrical port of a semiconductor opticalamplifier (SOA) acting as the optoelectronic mixer. Both the local oscillator (LO) and the intermediate frequency (IF) signals are directly distributed to/from the array pixels using fiber optics, that allows for remote LO generation and IF processing to recover the image. The results shown in this work demonstrate that the performances of the optoelectronic imaging array are similar to a reference all-electronic array, revealing the possibility of using this photonic architecture in future high-density, scalable, compact imaging arrays in microwave and millimeter wave ranges.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128318078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fast Optical Beamforming Architectures for Satellite-Based Applications 基于卫星应用的快速波束形成体系结构
Advances in Optical Technologies Pub Date : 2012-10-15 DOI: 10.1155/2012/385409
B. Vidal, T. Mengual, J. Marti
{"title":"Fast Optical Beamforming Architectures for Satellite-Based Applications","authors":"B. Vidal, T. Mengual, J. Marti","doi":"10.1155/2012/385409","DOIUrl":"https://doi.org/10.1155/2012/385409","url":null,"abstract":"Photonic technology offers an alternative implementation for the control of phased array antennas providing large time bandwidth products and low weight, flexible feeding networks. Measurements of an optical beamforming network for phased array antennas with fast beam steering operation for space scenarios are presented. Experimental results demonstrate fast beam steering between 4 and 8 GHz without beam squint.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130781424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Analyzing the Symmetry Properties of a Distribution in the Focal Plane for a Focusing Element with Periodic Angle Dependence of Phase 相位依赖周期角的聚焦元件焦平面分布对称性分析
Advances in Optical Technologies Pub Date : 2012-10-10 DOI: 10.1155/2012/918298
S. Khonina, A. Ustinov
{"title":"Analyzing the Symmetry Properties of a Distribution in the Focal Plane for a Focusing Element with Periodic Angle Dependence of Phase","authors":"S. Khonina, A. Ustinov","doi":"10.1155/2012/918298","DOIUrl":"https://doi.org/10.1155/2012/918298","url":null,"abstract":"We analyze the symmetry properties of the focal plane distribution when light is focused with an element characterized by a periodic angular dependent phase, sin () or cos (). The majority of wave aberrations can be described using the said phase function. The focal distribution is analytically shown to be a real function at odd values of m, which provides a simple technique for generating designed wave aberrations by means of binary diffractive optical elements. Such a possibility may prove useful in tight focusing, as the presence of definite wave aberrations allows the focal spot size to be decreased. The analytical computations are illustrated by the numerical simulation, which shows that by varying the radial parameters the focal spot configuration can be varied, whereas the central part symmetry is mainly determined by the parity of m: for even the symmetry order is 2m and for odd is m.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114123627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Cutting Properties of Austenitic Stainless Steel by Using Laser Cutting Process without Assist Gas 无辅助气体激光切割奥氏体不锈钢的切削性能
Advances in Optical Technologies Pub Date : 2012-10-02 DOI: 10.1155/2012/234321
H. Ozaki, Y. Koike, H. Kawakami, J. Suzuki
{"title":"Cutting Properties of Austenitic Stainless Steel by Using Laser Cutting Process without Assist Gas","authors":"H. Ozaki, Y. Koike, H. Kawakami, J. Suzuki","doi":"10.1155/2012/234321","DOIUrl":"https://doi.org/10.1155/2012/234321","url":null,"abstract":"Recently, laser cutting is used in many industries. Generally, in laser cutting of metallic materials, suitable assist gas and its nozzle are needed to remove the molten metal. However, because of the gas nozzle should be set closer to the surface of a workpiece, existence of the nozzle seems to prevent laser cutting from being used flexible. Therefore, the new cutting process, Assist Gas Free laser cutting or AGF laser cutting, has been developed. In this process, the pressure at the bottom side of a workpiece is reduced by a vacuum pump, and the molten metal can be removed by the air flow caused by the pressure difference between both sides of the specimen. In this study, cutting properties of austenitic stainless steel by using AGF laser cutting with 2 kW CO2 laser were investigated. Laser power and cutting speed were varied in order to study the effect of these parameters on cutting properties. As a result, austenitic stainless steel could be cut with dross-free by AGF laser cutting. When laser power was 2.0 kW, cutting speed could be increased up to 100 mm/s, and kerf width at specimen surface was 0.28 mm.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125414875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Laser Spectroscopic Investigations of Praseodymium I Transitions: New Energy Levels 镨I跃迁的激光光谱研究:新能级
Advances in Optical Technologies Pub Date : 2012-09-17 DOI: 10.1155/2012/639126
Z. Uddin, Driss El Bakkali, B. Gamper, S. Khan, I. Siddiqui, G. Guthöhrlein, L. Windholz
{"title":"Laser Spectroscopic Investigations of Praseodymium I Transitions: New Energy Levels","authors":"Z. Uddin, Driss El Bakkali, B. Gamper, S. Khan, I. Siddiqui, G. Guthöhrlein, L. Windholz","doi":"10.1155/2012/639126","DOIUrl":"https://doi.org/10.1155/2012/639126","url":null,"abstract":"We report the discovery of about 140 new energy levels of the neutral praseodymium atom, found by means of laser-induced fluorescence spectroscopy. Their energy has been determined with an uncertainty of 0.010 cm−1 using a wave number calibrated Fourier-transform spectrum.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130605335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Recent Advances in Semiconductor Surface-Emitting Lasers 半导体表面发射激光器的最新进展
Advances in Optical Technologies Pub Date : 2012-09-17 DOI: 10.1155/2012/234163
K. Panajotov, K. Panajotov, R. Michalzik, K. Choquette
{"title":"Recent Advances in Semiconductor Surface-Emitting Lasers","authors":"K. Panajotov, K. Panajotov, R. Michalzik, K. Choquette","doi":"10.1155/2012/234163","DOIUrl":"https://doi.org/10.1155/2012/234163","url":null,"abstract":"1Department of Applied Physics and Photonics, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium 2Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Boulevard, 1784 Sofia, Bulgaria 3 Institute of Optoelectronics, Ulm University, Albert-Einstein-Allee 45, 89081 Ulm, Germany 4Department of Electrical and Computer Engineering, University of Illinois, 208 North Wright Street, Urbana, IL 61801, USA","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126767929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Study of Factors Making Space-Contaminated Optical System Unusable 空间污染光学系统不可用因素研究
Advances in Optical Technologies Pub Date : 2012-09-06 DOI: 10.1155/2012/485212
Dakun Wu, Yanping Zhou, Fangkui Sun
{"title":"Study of Factors Making Space-Contaminated Optical System Unusable","authors":"Dakun Wu, Yanping Zhou, Fangkui Sun","doi":"10.1155/2012/485212","DOIUrl":"https://doi.org/10.1155/2012/485212","url":null,"abstract":"Molecular and particulate contamination of space optical surfaces can be extremely detrimental to optical system performance. In order to determine whether optical system is unusable, we must do a lot of tests. For reducing experimental effort, computational criterion for unusable space optical system is put forward, which is based on experimentation and calculation by 2D-FDTD (finite-difference time domain). And then factors making optical system unusable are studied when distribution of light intensity is consistent with the criterion. Results show that small particulate is more detrimental to optical system than big one for particle with high permittivity is. The distribution of particles making optical system unusable is also obtained.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127412640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fabrication and Evaluation of Large Area Mo/Si Soft X-Ray Multilayer Mirrors at Indus SR Facilities 印度SR设施中大面积Mo/Si软x射线多层反射镜的制作与评价
Advances in Optical Technologies Pub Date : 2012-08-15 DOI: 10.1155/2012/976868
P. Rao, M. Nayak, G. Lodha, S. Rai, A. Srivastava, M. Modi, A. Sagdeo
{"title":"Fabrication and Evaluation of Large Area Mo/Si Soft X-Ray Multilayer Mirrors at Indus SR Facilities","authors":"P. Rao, M. Nayak, G. Lodha, S. Rai, A. Srivastava, M. Modi, A. Sagdeo","doi":"10.1155/2012/976868","DOIUrl":"https://doi.org/10.1155/2012/976868","url":null,"abstract":"A, respectively. The samples are characterized using hard X-ray reflectivity and transmission electron microscopy. Soft X-ray performance tests of MLs are done by soft X-ray reflectivity using Indus-1 synchrotron radiation. ML coating with thickness errors of ∼0.03% per layer and interface roughness in the range of 2 to 5 ˚ A has been realized. The lateral variation of the periodicity is controlled within 0.5 ˚ A over the 300 × 100mm 2 area of the plane substrate by using substrate motion and","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"862 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125155505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Near-Field Diffraction from a Binary Microaxicon 二元微轴的近场衍射
Advances in Optical Technologies Pub Date : 2012-07-29 DOI: 10.1155/2012/974281
V. Kotlyar, S. Stafeev, R. Skidanov, V. Soifer
{"title":"Near-Field Diffraction from a Binary Microaxicon","authors":"V. Kotlyar, S. Stafeev, R. Skidanov, V. Soifer","doi":"10.1155/2012/974281","DOIUrl":"https://doi.org/10.1155/2012/974281","url":null,"abstract":"We study binary axicons of period 4, 6, and 8 μm fabricated by photolithography with a 1 μm resolution, 500 nm depth, and 4 mm diameter. Near-field diffraction focal spots varying in diameter from 3.5λ to 4.5λ (for the axicon of period μm) and from 5λ to 8λ (for the axicon with μm) are experimentally found on the optical axis at a distance of up to 40 μm from the axicon for the wavelength μm. The first focal spot is found at distance 2 μm ( μm), with the period of the focal spots being 2 μm ( μm) and 4 μm ( μm). Diffraction of linearly polarized plane and diverging waves is simulated using FullWAVE (RSoft) and a proprietary program BOR-FDTD, which implement finite-difference schemes to solve three-dimensional Maxwell's equations in the Cartesian and cylindrical coordinates. The numerically simulated values for diameters of the near-field focal spots for the axicon of period μm are in good agreement with the experimental values.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127195808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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